Measurement method and device for frost heaving volume change

Abstract

The present application discloses a method and device for measuring frost heave volume change. The method includes obtaining a first mass of a first measurement system containing a sample to be tested in air through a precision balance; after the sample to be tested, sealed by a seal, is immersed in a cold bath liquid in a container, the temperature of the cold bath liquid is continuously adjusted by a cooling device, and the cooling device circulates the coolant through a circulation pipe in the container; obtaining multiple second masses corresponding to the first measurement system at different temperatures of the cold bath liquid through a precision balance, with the temperature corresponding to the second mass one-to-one; based on Archimedes' buoyancy law, the volume value of the sample to be tested at different temperatures is calculated according to the first mass and the multiple second masses. The present application solves the problems of cumbersome operation and low measurement efficiency in actual applications of the existing method of obtaining the frost heave deformation of the sample by measuring the mass of the outflowing freezing liquid.

Description

Technical Field

[0001] The present application relates to the field of civil engineering technology, and in particular to a method and device for measuring frost heave volume change. Background Art

[0002] Cold regions are widespread in my country. With the development of the Chinese economy and increasing demand for resources, the development and construction of resource-rich cold regions has gradually attracted attention, driving the rise of cold-region engineering construction and the gradual development of infrastructure. However, engineering damage to structures caused by frost heave deformation has also come with it.

[0003] In seasonally frozen areas, differential frost heave is the primary cause of deformation, cracking, and even damage to structures such as buildings and roadbeds. Under low-temperature conditions, the frozen phase transition and migration of water in the soil cause the growth of ice (convex mirror-shaped ice) that causes frost heave volumetric deformation of the soil. The frost heave volumetric deformation patterns of soils with different moisture contents and pore structures vary, and changes in temperature, initial soil volume, and other factors alter the volumetric deformation of the soil. The property losses caused by frost heave in cold regions due to the year-round freeze-thaw cycle are significant. Therefore, studying the mechanisms governing soil frost heave under low-temperature conditions is a key topic in cryogenics. Detailed measurement of soil frost heave volumetric deformation at low temperatures is fundamental to a correct understanding of frost heave patterns.

[0004] Currently, a commonly used method for measuring frost heave deformation is to place the test sample in a sealed bag, then place the sealed bag in a freezing liquid. The mass of the freezing liquid that flows out is then measured to determine the sample's frost heave deformation. This method is simple in principle, but in practice, it requires continuous and accurate measurement of frost heave volume deformation at different temperatures to obtain a temperature-frost heave volume deformation curve. If measurements are performed in this manner, after measuring the frost heave volume at temperature T1, the cold bath liquid inside the sealed device has already flowed out. When measuring the frost heave volume again at temperature T2, the sample volume may be reduced. At this time, the cold bath liquid cannot flow back, and new sample preparation is required, making the operation cumbersome and affecting measurement efficiency. Summary of the Invention

[0005] The main purpose of this application is to provide a method and device for measuring frost heave deformation, so as to solve the problems of cumbersome operation and low measurement efficiency in actual application of the existing method of obtaining the frost heave deformation of the sample by measuring the mass of the outflowing freezing liquid.

[0006] In order to achieve the above-mentioned purpose, according to a first aspect of the present application, a method for measuring frost heave volume change is provided.

[0007] The method for measuring frost heave volume change according to the present application includes: obtaining a first mass of a first measurement system containing a sample to be tested in the air through a precision balance, the first measurement system also including a seal for sealing the sample to be tested, a fixing for suspending the sample to be tested on the precision balance, and metal blocks arranged at both ends of the sample to be tested; after the sample to be tested sealed by the seal is immersed in a cold bath liquid in a container, the temperature of the cold bath liquid is continuously adjusted by a cooling device, and the cooling device circulates the cooling liquid through a circulation pipe in the container; obtaining multiple second masses corresponding to the first measurement system under cold bath liquids of different temperatures through a precision balance, and the temperature corresponds to the second mass one-to-one; based on Archimedes' law of buoyancy, the volume value of the sample to be tested at different temperatures is calculated according to the first mass and the multiple second masses.

[0008] Optionally, the method of calculating the volume value of the sample to be tested at different temperatures based on the first mass and the multiple second masses based on Archimedes' law of buoyancy includes: calculating the first total discharge volume corresponding to each temperature based on the difference between the first mass and the second mass corresponding to each temperature, and the density of the cold bath liquid; obtaining the other discharge volumes in the first measurement system corresponding to each temperature except the discharge volume of the sample to be tested; and calculating the difference between the first total discharge volume corresponding to each temperature and the other discharge volumes corresponding to each temperature to obtain the volume value of the sample to be tested at each temperature.

[0009] Optionally, obtaining the other drainage volumes in the first measurement system corresponding to each temperature in addition to the drainage volume of the sample to be tested includes: obtaining the third mass of the second measurement system containing the metal sample in the air through the precision balance, the second measurement system also including the sealing member for sealing the metal sample, the fixing member for suspending the metal sample on the precision balance, and metal blocks arranged at both ends of the metal sample; after the metal sample sealed by the sealing member is placed in the container, the temperature of the cold bath liquid is continuously adjusted by the cooling device; obtaining multiple fourth masses corresponding to the second measurement system under cold bath liquids of different temperatures through a precision balance, the temperature corresponding to the fourth mass one-to-one; based on Archimedes' law of buoyancy, calculating the other drainage volumes corresponding to each temperature according to the third mass and the multiple fourth masses.

[0010] Optionally, the calculation of the other drainage volume corresponding to each temperature based on the third mass and the multiple fourth masses based on Archimedes' law of buoyancy includes: calculating the second total drainage volume corresponding to each temperature based on the difference between the third mass and the fourth mass corresponding to each temperature, and the density of the cold bath liquid; and subtracting the volume of the metal sample corresponding to each temperature from the second total drainage volume corresponding to each temperature to obtain the other drainage volume corresponding to each temperature.

[0011] Optionally, after calculating the volume value of the sample to be tested at different temperatures based on the first mass and the multiple second masses based on Archimedes' law of buoyancy, the method further includes: determining the frost heave volume change curve of the sample to be tested based on the volume value of the sample to be tested at different temperatures.

[0012] In order to achieve the above-mentioned purpose, according to a second aspect of the present application, a device for measuring frost heave volume change is provided.

[0013] The measuring device for frost heave volume change according to the present application includes: a precision balance, a container containing cold bath liquid, a cooling device, a circulation pipe, a metal block, a fixing part, a sealing part, and a calculation module, wherein the metal block is used to be set at both ends of the sample to be tested, the sealing part is used to seal the sample to be tested, the fixing part is used to suspend the sample to be tested on the precision balance, and the cooling device is used to circulate the cooling liquid through the circulation pipe in the container and adjust the temperature of the cold bath liquid; the precision balance is used to measure the first mass of a first measurement system containing the sample to be tested in the air, and multiple second masses corresponding to the first measurement system under cold bath liquids at different temperatures, the temperature corresponding to the second mass one-to-one, and the first measurement system includes the sample to be tested, the metal block, the fixing part, and the sealing part; the calculation module is used to calculate the volume value of the sample to be tested at different temperatures based on Archimedes' law of buoyancy according to the first mass and the multiple second masses.

[0014] Optionally, the calculation module also includes: a first calculation unit, used to calculate the first total discharge volume corresponding to each temperature based on the difference between the first mass and the second mass corresponding to each temperature, and the density of the cold bath liquid; a second calculation unit, used to obtain the other discharge volumes in the first measurement system corresponding to each temperature except the discharge volume of the sample to be tested; and a third calculation unit, which calculates the difference between the first total discharge volume corresponding to each temperature and the other discharge volumes corresponding to each temperature to obtain the volume value of the sample to be tested at each temperature.

[0015] Optionally, the metal block is also used to be set at both ends of the metal sample, the seal is also used to seal the metal sample, and the fixing member is used to suspend the metal sample on the precision balance; the precision balance is also used to measure the third mass of the second measurement system containing the metal sample in the air, and multiple fourth masses corresponding to the second measurement system under cold bath liquids at different temperatures, the temperature corresponding to the fourth mass one-to-one, and the second measurement system including the metal sample, the metal block, the fixing member, and the seal; the calculation module is also used to calculate the other displacement volume corresponding to each temperature based on Archimedes' law of buoyancy according to the third mass and the multiple fourth masses.

[0016] Optionally, the calculation module is also used to calculate the second total drainage volume corresponding to each temperature based on the difference between the third mass and the fourth mass corresponding to each temperature, and the density of the cold bath liquid; and subtract the volume of the metal sample corresponding to each temperature from the second total drainage volume corresponding to each temperature to obtain other drainage volumes corresponding to each temperature.

[0017] Optionally, the circulation pipe has two openings, one is a liquid inlet and the other is a liquid outlet, and the two openings are respectively connected to the liquid inlet pipe and the liquid outlet pipe of the cooling device.

[0018] Optionally, the fixing member includes a bracket, a hanging rope, and a hanging ring, wherein the hanging ring is used to connect the sealed sample to be tested to the hanging rope, the hanging rope is hung on the bracket, and the bracket is located on the precision balance.

[0019] Optionally, the sealing member includes a rubber membrane and a rubber band, wherein the rubber membrane is used to wrap and seal the sample to be tested and the metal blocks at both ends thereof, and the rubber band is used to bind and fix the outside of the rubber membrane.

[0020] In the method and device for measuring the frost heave volume change of the embodiment of the present application, the first mass of the first measurement system containing the sample to be tested in the air is obtained by a precision balance, and the first measurement system also includes a seal for sealing the sample to be tested, a fixing member for suspending the sample to be tested on the precision balance, and a metal block arranged at both ends of the sample to be tested; after the sample to be tested sealed by the seal is immersed in the cold bath liquid in the container, the temperature of the cold bath liquid is continuously adjusted by a cooling device, and the cooling device circulates the coolant through a circulation pipe in the container; a plurality of second masses of the first measurement system under cold bath liquids of different temperatures are obtained by a precision balance, and the temperature corresponds to the second mass one to one; based on Archimedes' buoyancy law, the volume value of the sample to be tested at different temperatures is calculated according to the first mass and the plurality of second masses. It can be seen that the measurement method of the frost heave volume change of the embodiment of the present application can be based on a sample for continuous measurement at different temperatures, and can ensure high measurement accuracy, solving the problems of cumbersome operation and low measurement efficiency in actual application of the existing method of obtaining the frost heave deformation of the sample by measuring the mass of the outflowing freezing liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings that constitute part of this application are used to provide a further understanding of this application and make other features, objects and advantages of this application more apparent. The illustrative embodiment drawings of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0022] Figure 1 Schematic diagram of a frost heave volume change measurement device provided according to an embodiment of the present application;

[0023] Figure 2 This is a flow chart of a method for measuring frost heave volume change according to an embodiment of the present application;

[0024] Figure 3 It is a schematic diagram of a frost heave volume change curve provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] According to an embodiment of the present application, a device for measuring frost heave volume change is provided, such as Figure 1 As shown, the device includes: a precision balance 1, a container 2 containing a cold bath liquid 21, a cooling device 3, a circulation pipe 4, a metal block 5, a fixing part, a sealing part, and a calculation module.

[0029] The metal blocks 5 are used to be placed at both ends of the test sample 8. Figure 1 As shown, a metal block 5 is provided at one end. The arrangement of the metal block 5 is to increase the average density and ensure that the sample to be tested 8 is completely immersed in the cold bath liquid 21. In actual application, a metal block 5 with a larger density can be selected. In addition, the bottom area of the metal block 5 can be selected to be the same as the bottom area of the sample to be tested 8. This makes it more convenient to seal the metal block 5 and the sample to be tested 8 together, and the sealing effect is also better. In order to meet the needs of measurement, the cold bath liquid 21 needs to select a solution with a low freezing point and a stable density, such as glycerol or ethylene glycol.

[0030] The seal is used to seal the sample to be tested 8. The seal is to prevent the cold bath liquid 21 from penetrating the sample, and the seal also needs to be made of a material with good ductility, such as a rubber material. The embodiment of the present application provides a sealing method, such as Figure 1 As shown, sealing is performed using a sealing member composed of a rubber film 71 and a rubber band 72, wherein the test sample 8 and the metal block 5 are wrapped and sealed with the rubber film 71, and then tied and fixed with rubber bands 72 on the outside of the rubber film 71, and the number of rubber bands 72 is not limited.

[0031] The fixing member is used to suspend the sample 8 to be tested on the precision balance 1. The embodiment of the present application provides a suspension placement method, such as Figure 1As shown, the fixing member includes a bracket 61, a hanging rope 62, and a hanging ring 63, wherein the hanging ring 63 is used to connect the sealed test sample 8 to the hanging rope 62, and the hanging rope 62 is hung on the bracket 61, and the bracket 61 is located on the precision balance 1.

[0032] The cooling device 3 is used to circulate the cooling liquid 31 through the circulation pipe 4 in the container 2 and adjust the temperature of the cold bath liquid 21. The specific circulation pipe 4 has two openings, one is the liquid inlet 41, and the other is the liquid outlet 42. The two openings are respectively connected to the liquid inlet pipe 32 and the liquid outlet pipe 33 of the cooling device 3. The cooling device 3 adjusts the temperature of the cooling liquid 31 according to the required temperature and transmits it to the circulation pipe 4 to adjust the temperature of the cold bath liquid 21 in the container 2 until the temperature of the cold bath liquid 21 reaches the required temperature. This embodiment provides a cooling device 3, such as Figure 1 As shown, it includes a compressor 34, a cooling system 35 filled with coolant 31, and a liquid inlet pipe 32 and a liquid outlet pipe 33 connecting the cooling system 35 and the circulation pipe 4. The coolant 31 can be other coolants with a low freezing point such as ethylene glycol, and will not solidify at least at the temperature required for measurement. Figure 1 The shape of the intermediate circulation pipe 4 is spiral, and of course, it can also be other shapes in practical applications.

[0033] The precision balance 1 is used to measure the first mass of the first measurement system containing the test sample 8 in the air, and multiple second masses corresponding to the first measurement system under different temperatures of the cold bath liquid 21. The temperature corresponds to the second mass one by one. The first measurement system includes the test sample 8, the metal block 5, the fixing part, and the sealing part. The use of the precision balance 1 can ensure a high measurement accuracy. The test sample 8 is made of the soil body of the frost heave body to be measured according to the preset size. In actual measurement applications, each type of soil body usually needs to measure the frost heave volume of different water contents. Therefore, the test sample can adopt the prefabricated pressing method to mix a certain proportion of soil and water evenly to obtain a test sample of preset size with a water content of w. Figure 1 2 shows a schematic diagram of the test state of multiple second masses corresponding to the first measurement system under the cold bath liquid 21. Each second mass is obtained after the test sample 8 sealed by the seal is immersed in the cold bath liquid in the container 2, and the mass value measured by the precision balance 1 is stabilized at the required temperature for a period of time (for example, 2 hours or other time that allows the test sample to be fully frozen and maintains a stable volume). Figure 1As shown, there is a schematic diagram of the edge contour line 81 of the test sample 8 after frost heaving. In addition, for the acquisition of the second mass, an example is described. Assuming that the temperature of the current cold bath liquid 21 is T1, and it is desired to obtain the volume value of the test sample 8 when the temperature of the cold bath liquid 21 is T2 (T2 < T1), after stabilizing the temperature of the cold bath liquid 21 to T2 and another 2 hours later, the measured value of the precision balance 1 is the second mass corresponding to the temperature T2.

[0034] A calculation module, which is used to calculate the volume values of the test sample 8 at different temperatures based on Archimedes' buoyancy law according to the first mass and multiple second masses. In the embodiments of the present application, the volume values of the test sample 8 at different temperatures are determined based on Archimedes' buoyancy law. Specifically, the calculation module includes: a first calculation unit, which is used to calculate the first total drainage volume corresponding to each temperature according to the difference between the first mass and the second mass corresponding to each temperature, and the density of the cold bath liquid 21; a second calculation unit, which is used to obtain the other drainage volumes in the first measurement system except the drainage volume of the test sample 8 corresponding to each temperature; a third calculation unit, which calculates the difference between the first total drainage volume corresponding to each temperature and the other drainage volumes corresponding to each temperature to obtain the volume value of the test sample 8 at each temperature. The calculation module can be a general computer, or a dedicated computer, or a movable intelligent terminal, etc., which are devices or equipment capable of executing the calculation process in the calculation module. The following further details the calculation of the volume values of the test sample 8 at different temperatures:

[0035] When the test sample 8 is not immersed (completely in the air) in the cold bath liquid 21, the first mass obtained by the precision balance 1 is the total mass of the first measurement system. When the test sample 8 is immersed (completely immersed) in the cold bath liquid 21, as Figure 3 shown, the second mass obtained by the precision balance 1 is the mass corresponding to the first measurement system after removing the buoyancy force received. That is:

[0036] M1 = G1 / g, (1)

[0037] M2 = (G1 - F Figure 3 ) / g (2) [[ID=第十七条]]

[0038] Where, M1 is the first mass, G1 is the gravity of the first measurement system, F 1浮 is the buoyancy force received by the first measurement system after the test sample 8 is immersed in the cold bath liquid 21, and g is the gravitational constant.

[0039] According to Archimedes' buoyancy law, it can be obtained that:

[0040] F 1浮 = ρgV1 (3)

[0041] Wherein, ρ is the density of the cold bath liquid 21, V1 is the total volume of the cold bath liquid discharged after the test sample 8 is immersed in the cold bath liquid 21, that is, the first total discharge volume

[0042] Combining the above formulas, (1)(2)(3) we can get:

[0043] V1=(M1-M2) / ρ (4)

[0044] According to formula (4), the first calculation unit can calculate the first total discharge volume V1. Each second mass is obtained at a different temperature T. Therefore, multiple first total discharge volumes V1 corresponding to multiple temperatures can be obtained based on different second masses.

[0045] And since V1=V T +V2 (5)

[0046] Among them, V T is the volume of the test sample 8 at temperature T, V2 is the volume of the other liquids except the volume of the test sample 8 at temperature T, corresponding to Figure 1 , V2 is the metal block 5, the sealing part (rubber film 71 and rubber band 72), and the part of the fixing part immersed in the cold bath liquid ( Figure 1 The total drainage volume of the partial suspension rope 62 and the ring 63 is shown in FIG.

[0047] Therefore, the third calculation unit can calculate the volume value V of the test sample 8 according to formula (4) (5): T , but before that, we need to determine the value of the other discharge volume V2. The calculation of the other discharge volume V2 is explained below: The calculation of the other discharge volume V2 also requires the use of Figure 1The frost heave volume change measurement device is used for measurement, specifically, the metal block 5 is set at both ends of the metal sample, the sealant seals the metal sample, and the fixing part suspends the metal sample on the precision balance 1. Then the third mass of the second measurement system containing the metal sample in the air and the multiple fourth masses corresponding to the second measurement system under the cold bath liquid 21 at different temperatures (the temperature selection here is consistent with the temperature selected for the aforementioned test sample 8 to be immersed in the cold bath liquid 21) are measured by the precision balance 1. The temperature corresponds to the fourth mass one by one, and the second measurement system includes a metal sample, a metal block 5, a fixing part, and a sealant. After obtaining the third mass and multiple fourth masses, the calculation module calculates the other drainage volume corresponding to each temperature based on the third mass and multiple fourth masses based on Archimedes' buoyancy law. Specifically, the second total drainage volume corresponding to each temperature is calculated based on the difference between the third mass and the fourth mass corresponding to each temperature, and the density of the cold bath liquid; then the second total drainage volume corresponding to each temperature is subtracted from the volume of the metal sample corresponding to each temperature to obtain the other drainage volume corresponding to each temperature. The calculation of the other drainage volume corresponding to each temperature is further described in detail below:

[0048] When the metal sample is not immersed in the cold bath 21 (completely immersed in air), the third mass obtained by the precision balance 1 is the total mass of the second measurement system. When the test sample 8 is immersed in the cold bath 21 (completely immersed), the fourth mass obtained by the precision balance 1 is the mass of the second measurement system after removing the buoyancy. That is:

[0049] M3=G2 / g, (6)

[0050] M4=(G2-F 2浮 ) / g (7)

[0051] Among them, M3 is the third mass, G2 is the gravity of the second measurement system, and F 2浮 is the buoyancy of the second measuring system after the metal sample is immersed in the cold bath liquid 21, and g is the gravity constant.

[0052] According to Archimedes' law of buoyancy:

[0053] F 2浮 =ρgV3 (8)

[0054] Wherein, ρ is the density of the cold bath liquid 21, V3 is the total volume of the cold bath liquid discharged after the metal sample is immersed in the cold bath liquid, that is, the second total discharge volume

[0055] Combining the above formulas (6)(7)(8), we can get:

[0056] V3=(M3-M4) / ρ (9)

[0057] Therefore, according to formula (9), the second total discharge volume V3 can be calculated. Each fourth mass is obtained at a different temperature T. Therefore, multiple second total discharge volumes V3 corresponding to multiple temperatures can be obtained based on multiple fourth masses.

[0058] And since, V3=V4+V2 (10)

[0059] Where V4 is the volume of the metal sample at temperature T.

[0060] Since the metal sample is of known size and its change with temperature can be ignored, V4 can be calculated based on its size. Assuming that the metal sample is cylindrical, the volume V4 of the metal sample can be calculated based on its diameter and height. Therefore, the other drainage volume V2 can be calculated according to formulas (9) and (10).

[0061] V2=V3-V4=(M3-M4) / ρ-V4 (11)

[0062] Each V2 corresponds to an M4, and each M4 corresponds to a temperature T, so we can get the other drainage volumes V2 corresponding to different temperatures T. After getting the other drainage volumes V2 corresponding to different temperatures T, we can calculate the volume value V of the test sample 8 according to formulas (4) and (5): T ,Right now:

[0063] V T =V1-V2=(M1-M2) / ρ-(M3-M4) / ρ-V4.

[0064] It should be noted that, to ensure measurement accuracy, the volumes of the test sample 8 and the metal sample in air in the embodiment of the present application are set to be consistent. In addition, for different types of soil or the same type of soil with different water contents, that is, different test samples 8, if the test samples are of the same size and the selected temperature is the same, V2 is universal and does not need to be measured separately for different test samples 8.

[0065] From the above description, it can be seen that in the frost heave volume change measurement device of the embodiment of the present application, a precision balance can be used to continuously measure the weight change of the system based on a sample during the low-temperature frost heave process, and then the frost heave deformation of the sample to be tested is calculated. It has the advantages of sustainable and non-destructive measurement, and can ensure high measurement accuracy, which solves the problems of cumbersome operation and low measurement efficiency in actual applications of the existing method of obtaining the frost heave deformation of the sample by measuring the mass of the outflowing freezing liquid.

[0066] According to an embodiment of the present application, a method for measuring frost heave volume change is also provided. The method is applied to the frost heave volume change measuring device in the aforementioned embodiment, such as Figure 2As shown, the method includes the following steps S101-S104: S101. Obtaining a first mass of a first measurement system containing a sample to be tested in air by a precision balance; wherein the first measurement system also includes a sealing member for sealing the sample to be tested, a fixing member for suspending the sample to be tested on the precision balance, and metal blocks arranged at both ends of the sample to be tested; S102. After the sample to be tested sealed by the sealing member is immersed in a cold bath liquid in a container, the temperature of the cold bath liquid is continuously adjusted by a cooling device, and the cooling device circulates the cooling liquid through a circulation pipe in the container; S103. Obtaining multiple second masses of the first measurement system under cold bath liquids of different temperatures by a precision balance, the temperature and the second mass correspond one-to-one, that is, one temperature corresponds to one second mass; S104. Based on Archimedes' law of buoyancy, the volume value of the sample to be tested at different temperatures is calculated according to the first mass and the multiple second masses.

[0067] In step S101, the sample to be tested 8 and two metal blocks 5 are placed together. Figure 1 The package in the embodiment is packaged and the fixing part is hung on the precision balance 1 to obtain the first mass; in step S102, the packaged test sample 8 is immersed in the cold bath liquid 21, and the first mass is obtained by Figure 1 The cooling device 3 in the embodiment adjusts the temperature of the cold bath liquid 21 according to the measurement requirements. After the cold bath liquid 21 stabilizes at a certain temperature and lasts for a period of time (for example, 2 hours. In actual applications, different times can be set according to the type of sample 8 to be tested), step 103 is executed to obtain the second mass. Different temperatures of the cold bath liquid 21 can obtain different second masses. In step S104, based on Archimedes' buoyancy law, the volume value of the sample to be tested 8 at different temperatures is calculated according to the first mass and multiple second masses. Specifically, the first total discharge volume V1 corresponding to each temperature is calculated based on the difference between the first mass M1 and the second mass M2 corresponding to each temperature, and the density ρ of the cold bath liquid 21, specifically V1 = (M1-M2) / ρ;

[0068] Secondly, obtain the other drainage volumes except the drainage volume of the test sample 8 in the first measurement system corresponding to each temperature; obtain the other drainage volumes corresponding to each temperature based on Figure 1The measurement device in the embodiment obtains, specifically including: obtaining the third mass M3 of the second measurement system containing the metal sample in the air through the precision balance 1, the second measurement system also includes a seal for sealing the metal sample, a fixing part for suspending the metal sample on the precision balance 1, and metal blocks 5 arranged at both ends of the metal sample; after the metal sample sealed by the seal is immersed (completely immersed) in the cold bath liquid 21 in the container 2, the temperature of the cold bath liquid 21 is continuously adjusted by the cooling device 3; obtaining the cold bath liquid 21 at different temperatures through the precision balance 1, the second measurement system corresponds to multiple fourth masses M4, the temperature corresponds to the fourth mass one-to-one, that is, one temperature corresponds to one fourth mass; based on Archimedes' law of buoyancy, the other discharge volume V2 corresponding to each temperature is calculated according to the third mass M3 and the multiple fourth masses M4. Specifically: V2 = (M3-M4) / ρ-V4;

[0069] Finally, the difference between the first total discharge volume V1 corresponding to each temperature and the other discharge volumes V2 corresponding to each temperature is calculated to obtain the volume value V of the sample to be tested at each temperature. T That is, V T =V1-V2=(M1-M2) / ρ-(M3-M4) / ρ-V4.

[0070] Based on the above steps, when a test sample is prepared, the volume value of the test sample at different temperatures can be obtained; based on the volume value of the test sample at different temperatures, the frost heave volume change curve of the test sample can be determined, such as Figure 3 The figure shows a schematic diagram of the frost heave curve of a certain sample to be tested, where the horizontal axis is the temperature T, T4 has the lowest temperature but the largest absolute value, and the vertical axis is the volume value V. Each temperature and the corresponding volume value can determine a point, and multiple points are connected to form the frost heave curve a. Moreover, from the volume value V of the sample to be tested, T In the calculation formula, it can be seen that the accuracy of the measurement method in the embodiment of the present application mainly depends on the accuracy of the mass. Therefore, the precision of the volume value obtained in the embodiment of the present application can be made higher in accuracy by using a precision balance for measuring the mass. Each volume value corresponds to a temperature point. Therefore, when obtaining the frost heave volume change curve, the higher the accuracy of the volume value, the more dense the corresponding temperature points can be selected. The denser the temperature points, the higher the accuracy of the frost heave volume change curve. This can provide more accurate data support for the analysis of the frost heave volume change law of the sample to be tested. In addition, Figure 3 The middle curve b is a curve showing the change of the discharge volumes of other liquids except the discharge volume of the test sample 8 at different temperatures.

[0071] From the above description, it can be seen that in the measurement method of the frost heave volume change of the embodiment of the present application, the first mass of the first measurement system containing the sample to be tested in the air is obtained by a precision balance, and the first measurement system also includes a seal for sealing the sample to be tested, a fixing member for suspending the sample to be tested on the precision balance, and a metal block arranged at both ends of the sample to be tested; after the sample to be tested sealed by the seal is immersed in the cold bath liquid in the container, the temperature of the cold bath liquid is continuously adjusted by the cooling device, and the cooling device circulates the coolant through the circulation pipe in the container; the multiple second masses of the first measurement system under the cold bath liquid of different temperatures are obtained by the precision balance, and the temperature corresponds to the second mass one by one; based on Archimedes' buoyancy law, the volume value of the sample to be tested at different temperatures is calculated according to the first mass and the multiple second masses. It can be seen that the measurement method of the frost heave volume change of the embodiment of the present application can be based on a sample for continuous measurement at different temperatures, and can ensure high measurement accuracy, solving the problem of cumbersome operation and low measurement efficiency in actual application of the existing method of obtaining the frost heave deformation of the sample by measuring the mass of the outflowing freezing liquid.

[0072] Obviously, those skilled in the art should understand that the modules or steps of the present application described above can be implemented using a general-purpose computing device. They can be concentrated on a single computing device or distributed across a network consisting of multiple computing devices. Alternatively, they can be implemented using program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be fabricated into separate integrated circuit modules, or multiple modules or steps can be fabricated into a single integrated circuit module for implementation. Thus, the present application is not limited to any specific combination of hardware and software.

[0073] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A method for measuring frost heave volume change, characterized in that: The method comprises: Obtaining a first mass of a first measurement system containing a sample to be tested in air using a precision balance, wherein the first measurement system further includes a sealing member for sealing the sample to be tested, a fixing member for suspending the sample to be tested on the precision balance, and metal blocks provided at both ends of the sample to be tested; After the test sample sealed by the sealing member is immersed in the cold bath liquid in the container, the temperature of the cold bath liquid is continuously adjusted by a cooling device, and the cooling device circulates the cooling liquid through a circulation pipe in the container; Obtaining multiple second masses corresponding to the first measurement system under different temperatures of cold bath liquid using a precision balance, wherein the temperatures correspond to the second masses one-to-one; Based on Archimedes' law of buoyancy, the volume values of the sample to be tested at different temperatures are calculated according to the first mass and the plurality of second masses.

2. The method for measuring frost heave volume change according to claim 1, wherein: Calculating the volume value of the sample to be tested at different temperatures based on the first mass and the plurality of second masses based on Archimedes' law of buoyancy includes: Calculating a first total liquid discharge volume corresponding to each temperature according to a difference between the first mass and the second mass corresponding to each temperature, and a density of the cold bath liquid; Obtaining other discharge volumes except the discharge volume of the sample to be tested in the first measurement system corresponding to each temperature; The difference between the first total discharge volume corresponding to each temperature and the other discharge volumes corresponding to each temperature is calculated to obtain the volume value of the sample to be tested at each temperature.

3. The method for measuring frost heave volume change according to claim 2, wherein: The obtaining of other discharge volumes except the discharge volume of the sample to be tested in the first measurement system corresponding to each temperature includes: Obtaining a third mass of a second measurement system containing a metal sample in air by means of the precision balance, wherein the second measurement system further comprises the sealing member for sealing the metal sample, the fixing member for suspending the metal sample on the precision balance, and metal blocks provided at both ends of the metal sample; After the metal sample sealed by the sealing member is placed in the container, the temperature of the cold bath liquid is continuously adjusted by the cooling device; Obtaining multiple fourth masses corresponding to the second measurement system under different temperatures of the cold bath liquid by a precision balance, wherein the temperatures correspond to the fourth masses in a one-to-one manner; Based on Archimedes' law of buoyancy, the other displacement volumes corresponding to each of the temperatures are calculated according to the third mass and the plurality of fourth masses.

4. The method for measuring frost heave volume change according to claim 3, characterized in that: Calculating the other displacement volumes corresponding to each temperature based on the third mass and the plurality of fourth masses based on Archimedes' law of buoyancy includes: Calculating a second total liquid discharge volume corresponding to each temperature according to a difference between the third mass and the fourth mass corresponding to each temperature, and the density of the cold bath liquid; The volume of the metal sample corresponding to each temperature is subtracted from the second total drainage volume corresponding to each temperature to obtain the other drainage volume corresponding to each temperature.

5. The method for measuring frost heave volume change according to claim 1, characterized in that: After calculating the volume values of the sample to be tested at different temperatures according to the first mass and the plurality of second masses based on Archimedes' law of buoyancy, the method further includes: The frost heave volume change curve of the sample to be tested is determined according to the volume values of the sample to be tested at different temperatures.

6. A device for measuring frost heave volume change, characterized in that: The device includes: a precision balance, a container containing a cold bath liquid, a cooling device, a circulation pipe, a metal block, a fixing part, a sealing part, and a calculation module. The metal blocks are used to be arranged at both ends of the sample to be tested, the sealing member is used to seal the sample to be tested, the fixing member is used to suspend the sample to be tested on the precision balance, and the cooling device is used to circulate the coolant through the circulation pipe in the container and adjust the temperature of the cold bath liquid; The precision balance is used to measure a first mass of a first measurement system containing the test sample in air, and a plurality of second masses corresponding to the first measurement system in cold bath liquids at different temperatures, wherein the temperatures correspond to the second masses in a one-to-one manner, and the first measurement system includes the test sample, the metal block, the fixing member, and the sealing member; The calculation module is used to calculate the volume value of the sample to be tested at different temperatures according to the first mass and the multiple second masses based on Archimedes' law of buoyancy.

7. The frost heave volume change measuring device according to claim 6, characterized in that: The calculation module also includes: a first calculating unit, configured to calculate a first total liquid discharge volume corresponding to each of the temperatures according to a difference between the first mass and a second mass corresponding to each of the temperatures, and a density of the cold bath liquid; a second calculation unit, configured to obtain other discharge volumes except the discharge volume of the sample to be tested in the first measurement system corresponding to each temperature; The third calculation unit calculates the difference between the first total discharge volume corresponding to each temperature and the other discharge volumes corresponding to each temperature to obtain the volume value of the sample to be tested at each temperature.

8. The frost heave volume change measuring device according to claim 6, characterized in that: The circulation pipe has two openings, one of which is a liquid inlet and the other is a liquid outlet. The two openings are respectively connected to the liquid inlet pipe and the liquid outlet pipe of the cooling device.

9. The frost heave volume change measuring device according to claim 6, characterized in that: The fixing parts include a bracket, a hanging rope and a hanging ring. The hanging ring is used to connect the sealed sample to be tested to the hanging rope, the hanging rope is hung on the bracket, and the bracket is located on the precision balance.

10. The frost heave volume change measuring device according to claim 6, characterized in that: The sealing member includes a rubber film and a rubber band. The rubber film is used to wrap and seal the sample to be tested and the metal blocks at both ends thereof, and the rubber band is used to bind and fix the outside of the rubber film.

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